Author Archive - Jeff

Math
Engine A can work 5 hours on 10 liters of fuel while engine B can work 3 hours on 15 liters of fuel. If engine efficiency is defined as a reciprocal to the hourly fuel consumption rate, what is the ratio of the efficiency of...

Math
Is a prime number?
(1)
(2) is an integer
Question Discussion & Explanation
Correct Answer - B - (click and drag your mouse to see the answer)
Verbal
As criminal activity on the Internet becomes more and more sophisticated, not only are thieves able...

Math
In a certain company, employees receive their salary on a monthly basis and are paid on either 10th or 20th of each month. If 65 percent of all managers are paid on 10th of each month and 79% of employees who are paid on 20th...

Math
1000 dollars were converted into pounds and then the pounds were converted back into dollars at the same exchange rate of pounds per dollar. If a commission of is levied on any exchange operation, what dollar amount was left...

Math
An electronic clock shows time in hours and minutes. For example, 08:15 means that it is now a quarter past eight. If one looks at the clock at some time between 6:00 and 9:00, what is the probability that he will see the digit 8...